Modern High Back Ergonomic Mesh Back Computer Desk Office Chair with Headrest and Lumbar Support Black Breathable mesh back with Padded Fabirc Mesh Seat provide all-day support Built-in headrest and lumbar support offers additional support for the neck and lumbar. The adjustable and lockable tilt function increases stability and control in different sitting positions. Strong 5 Star metal foot with pulley lead 360Degree Swivel CA117 Fire Retardant Foam . Assembly instructions included